.Net Core :: Slow first response

1.txt

$curl -o /dev/null -s -w %{time_total}\\n https://localhost:5001
0.470427

$curl -o /dev/null -s -w %{time_total}\\n https://localhost:5001
0.034931

$curl -o /dev/null -s -w %{time_total}\\n https://localhost:5001
0.037043

2.txt

# Start server

$dotnet dist/test.dll
info: Microsoft.Hosting.Lifetime[0]
      Now listening on: http://localhost:5000
info: Microsoft.Hosting.Lifetime[0]
      Now listening on: https://localhost:5001
      
info: Application.WarmupServices[0]
      Starting IHostedService...
      
info: Microsoft.Hosting.Lifetime[0]
      Application started. Press Ctrl+C to shut down.
info: Microsoft.Hosting.Lifetime[0]
      Hosting environment: Production
info: Microsoft.Hosting.Lifetime[0]

# Result

$curl -o /dev/null -s -w %{time_total}\\n https://localhost:5001
0.040194

$curl -o /dev/null -s -w %{time_total}\\n https://localhost:5001
0.035138

$curl -o /dev/null -s -w %{time_total}\\n https://localhost:5001
0.028956

Program.cs

public class Program
{
    public static void Main(string[] args)
    {
        CreateHostBuilder(args).Build().Run();
    }

    public static IHostBuilder CreateHostBuilder(string[] args) =>
        Host.CreateDefaultBuilder(args)
            .ConfigureWebHostDefaults(webBuilder =>
            {
                webBuilder.UseStartup<Startup>();
            })
        .ConfigureServices(
            services => services.AddHostedService<WarmupServices>());

}

WarmupServices.cs

public class WarmupServices : IHostedService, IDisposable
{
    private readonly ILogger _logger;
    private readonly HttpClient httpClient;

    public WarmupServices(ILogger<WarmupServices> logger)
    {
        _logger = logger;
        httpClient = new HttpClient();
    }

    public Task StartAsync(CancellationToken cancellationToken)
    {
        _logger.LogInformation("Starting IHostedService...");

        httpClient.GetAsync("<Endpoint URL>");

        return Task.CompletedTask;
    }

    public Task StopAsync(CancellationToken cancellationToken)
    {
        _logger.LogInformation("StoppingIHostedService...");
        return Task.CompletedTask;
    }

    public void Dispose()
    {
        httpClient?.Dispose();
    }
}

so this will start http server and send first request as well? to make it quick for actual first request?

so this will start http server and send first request as well? to make it quick for actual first request?
yes, my result in file 2.txt

Beautiful

simple but effective